The 8 Best Liquid Lawn Fertilizers – 2020 Buying Guide

There are many great different options out there when it comes to fertilizing your grass.

If you are looking for something that can be applied quickly, effectively, and easily, liquid fertilizer is the way to go.

The best liquid lawn fertilizers give your lawn everything it needs for a longer period of time to grow greener and fuller and stay healthier.

Here are some of the main reasons why you should choose a liquid fertilizer and some of the best out there products. Also, See Best Fertilizer for Indoor Plants, Fertilizer for Vegetable Garden, Fertilizer for Tomatoes.

Best Liquid Lawn Fertilizer

Advanced Lawn Food Natural Liquid Fertilizer

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This Basic Lawn Solutions fertilizer is a well-balanced blend of the important macronutrients your spring and summer lawn requires including nitrogen, phosphate, and potash. It also has an extract of seaweed to stimulate maximum growth.

One of the notable things about this liquid fertilizer is that it contains nitrogen that is both short and long-acting. That means it helps your lawn grow fast and keeps it long green and lush. It also increases root strength and stress tolerance in your lawn.

Easy Lawn Solutions Fertilizer is ultra-concentrated and comes with a sprayer attachment in a compact ready-to-use bottle. Attach it to any standard garden hose for quick, simple, and precise application. This formula works on all types of grass and up to 3,200 square feet of a 32-ounce bottle of treats.

Simple Lawn Solutions Extreme Grass Growth Lawn Booster

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If you are looking for something that is both safe and non-toxic, take a look at this Basic Lawn Solutions fertilizer. It is ideal for growing thicker your lawn or for accelerating growth and can be used on new or existing sod.

One cool thing about this product is it intensifies the reactions that occur naturally in the soil between your lawn and the minerals that can help prevent mineral deficiencies. It works likewise on any form of grass.

This drug contains no harsh chemicals and is made with natural ingredients of food-grade in the USA. It’s pet-friendly and child-friendly so you can deliver great results without worrying.

Simple to add, just attach the bottle to a garden hose and you’re ready to go. The 32-ounce bottle covers approximately 3,200 square feet.

Superior Nitrogen & Potash 15-0-15 NPK

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Here’s another great Basic Lawn Solutions product which we just have to recommend. This is a great option if your lawn shows signs of a deficiency of potassium or nitrogen such as yellow or brown areas and patchy growth. Note that this product does not contain phosphate.

This formula helps grow your grass quicker, greener, and stronger. Plus, it contains humic/fulvic acid to help the fertilizer move or better outcomes throughout the plant. This will help enhance the ability of your lawn to withstand heat and cold and is beneficial even in sandy soils.

A bottle of 32 ounces treats 3,200 square feet and works on all grass types including bluegrass and palmetto. There are no harsh chemicals, only organic ingredients of food quality that will not stress your lawn and are safe for pets and children.

The bottle comes with an easy-to-use sprayer so all you have to do is attach it and add it to your hose. Since this product is intended to combat shortages, be sure to keep your lawn watered to ensure the grass can properly absorb the nutrients it needs.

Rapid Green & Growth Liquid Fertilizer

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If you find more weeds, less lawn clippings, and yellow grass, there is a fair chance that your lawn has a deficiency in nitrogen. This LawnStar liquid lawn food is a perfect alternative for combating it. This formula includes nitrogen quick and slow-release and works for long-term development.

Use this product in the spring and summer to kick-start growth and keep it going all season. Not only will you see results but after a few weeks, they will not fade.

This one-gallon container contains enough fertilizer for up to 16,000 square feet of treatment. The container comes with simple mixing instructions to figure out how much to use for your lawn. You’ll need a pump sprayer garden trouser for application.

The top-quality sources of nitrogen used in this formula are effective on all types of grass including Bermuda grass and Fine Fescue. If you’re not happy with the performance, LawnStar provides a 30-day money-back guarantee.

Urban Farm Fertilizers Liquid Lawn Fertilizer

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When you hear the words “hand-crafted” and “micro-brewed,” the first thing you think of might not be fertilizer. But that only shows how much time and effort Urban Farm Fertilizers put in their liquid lawn formula.

This formula gives all the micro and macro nutrition your lawn needs with nitrogen, phosphorus, and potassium balances as well as iron, mycorrhizae, humic acid, and more. It provides fast results that last the entire season.

When using a hose sprayer or tow-behind tank, one gallon of this solution treats 5,000 square feet for at least eight applications (or 40,000 square feet altogether). It works for all forms of lawns and turf and is perfect for quick or long-term maintenance treatments.

LawnStar Chelated Liquid Iron (32 OZ) for Plants

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LawnStar’s other great choice is this flexible formula that works not only on your lawn but also on shrubs, trees, and flowers. It does not contain nitrogen, potassium, or phosphorus and it works by adding chelated liquid iron to grass and soil.

Iron deficiency is a common cause of yellowing, early dormancy, and failure to thrive in general. Chelated liquid iron helps to combat these problems, restoring your lawn by increasing the production of metabolism and chlorophyll.

Not all of that, this fertilizer improves root production for long-term growth and helps increase its resistance to severe variations in temperature. It is also based on sugar so it is much healthier than some other chelated alternatives.

What are this product covers depends on how you plan to use it. Detailed instructions are on the side of the bottle. Dilute then apply with a sprayer with the appropriate amount of water.

This liquid fertilizer also earns a money-back guarantee from LawnStar. If after 30 days you’re not satisfied, they will give you a refund that has been requested for no-questions.

Grass So Green 7-7-7 F4G Liquid Fertilizer

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Another environmentally friendly alternative is this Grass So Green liquid fertilizer. It contains the special Bio Builder from the company, a special blend of organic ingredients that help improve the quality of the soil, thus making your grass grow green and solid.

This is an all-purpose mix that fits both cool grass and warm-season grass. A one-gallon container for one month feeds up to 2000 square feet.

It is worth noting that this product was specially designed to be used with an irrigation system that will be delivered over a long period of time to your lawn in small doses. You can’t use a sprayer to apply it and expect the same effective results.

This product is compatible with formulae for Nature Shield and Rid O Rust. It is also safe for children and pets and made in the United States. Plus, if you’re not happy with the outcome it’s covered with a money-back guarantee.

Scotts Turf Builder Starter Food for New Grass Ready-Spray

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It is worth noting that this product was specially designed to be used with an irrigation system that will be delivered over a long period of time to your lawn in small doses. You can’t use a sprayer to apply it and expect the same effective results.

This product is compatible with formulae for Nature Shield and Rid O Rust. It is also safe for children and pets and made in the United States. Plus, if you’re not happy with the outcome it’s covered with a money-back guarantee.

This bottle, of 32 ounces, covers up to 1,800 square feet. It’s easy to apply, too, just attach it to any garden hose and you can simultaneously feed and water your new grass.

The first application will be after the seeds of grass have begun to sprout. Spray again a week later and again a week later, for best results.

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When to Apply Liquid Lawn Fertilizer?

When applying your liquid fertilizer it depends on the kind you use. Detailed instructions can usually be found on the side of the bottle. Having said that, certain general guidelines need to be kept in mind.

If the fertilizer is used once a year, apply it around Labor Day. That’s when your lawn needs it the most, and all the nutrients are soaked up. It also helps to build up a buffer in the soil to help it get ahead during the cold fall and winter.

If you want your fertilizer to be applied twice a year, add a second application in October to give your lawn some extra food for the winter.

You may also choose to do a third application in early spring and if necessary, a fourth mid-summer. If you apply fertilizer throughout the year, it’s best to give a smaller dose in the spring unless you notice slow growth or discoloration.

Some of the products which we have chosen for our recommendations are for spring and summer. In this case, the first dosage is typically given in the summer with smaller doses administered every few weeks in the spring.

Take caution when applying liquid chemical fertilizer when it is really hot and humid at the summer peak. In fact, it can damage your lawn. Fortunately, in this weather, organic possibilities are safe to use. In our list, we have included several organic options.

The most important thing as far as what time of day to apply fertilizer is to avoid the hottest part of the day. Applying fertilizer will kill the grass when the weather is too hot and humid. In the summer, applications are best early in the morning.

Finally, when the ground is moist it is best to fertilize your lawn. It would help it absorb quicker. It’s also less likely to burn or damage your grass than when you apply it to dry soil.

How to Apply Liquid Lawn Fertilizer?

Again, it does differ. The most important factors to determine how much fertilizer your lawn size is, and how much nitrogen it needs all year round.

It’s really important to know the right amount of fertilizer to apply. So little and you are not going to get the results that you’re looking for. Too little and you’re not going to get the result you ‘re aiming for; too much and you might end up damaging your lawn seriously.


The best way to get a soil test is to find out how much fertilizer you need to apply to your lawn. Fertilizers are classified by their nitrogen, phosphorus, or potassium content. This is expressed in NPK format. A soil test can tell you how much will help you choose the right fertilizer from each you need.

It’s not as difficult to test the ground as you would imagine. Most major home and garden centers sell easy-to-use kits in liquid grass fertilizers that measure all three of the major elements. Once you know what your soil needs, you can pick a fertilizer that suits the needs of your lawn.

How Much to Apply

When you know the right fertilizer is being used, follow the instructions on the side of the container. These fertilizers usually have pretty clear instructions as to how much you should use throughout the season for initial applications as well as for the maintenance doses.


It is really important to make sure you know what your lawn needs in order to select the right liquid fertilizer for the lawns. The best way to do this is by a soil test. They are easy to use, cheap, and available at most house and garden centers.

If you know what NPK ratio you need to choose from, there are plenty of great choices. Here we have included a nice variety of quality products to help you find one which works best for your lawn.

Also, See Best 10 Fertilizer for Grass in Summer – Buying Guide 2020